Defect tolerant and dimension dependent ferromagnetism in MnSe₂

Area of Science:

• Condensed Matter Physics
• Materials Science
• Computational Chemistry

Background:

• Two-dimensional (2D) materials are crucial for next-generation electronics.
• Manganese selenide (MnSe2) is a promising material for spintronic applications.
• Understanding the properties of MnSe2 across different dimensions is essential.

Purpose of the Study:

• To investigate the structural, vibrational, electronic, and magnetic properties of 2D MnSe2.
• To explore the stability and behavior of MnSe2 in monolayer, nanoribbon, and quantum dot forms.
• To assess the potential of MnSe2 for spintronic devices.

Main Methods:

• Density Functional Theory (DFT)-based calculations.
• Vibrational spectrum analysis.
• Electronic structure calculations.

Main Results:

• Dynamical stability confirmed for both ferromagnetic and antiferromagnetic phases of 2D MnSe2.
• 1T-MnSe2 exhibits ferromagnetic metallic behavior, stable even with Se vacancies.
• Nanoribbons and quantum dots show ferromagnetic-to-antiferromagnetic magnetic phase transitions due to metal-metal interactions.

Conclusions:

• 2D MnSe2 possesses robust ferromagnetic metallic characteristics, ideal for spintronics.
• Dimension-dependent magnetic properties are observed in MnSe2 nanostructures.
• MnSe2 is a strong candidate for advanced spintronic device applications.